Study of NDVI and Climate Change in Maqu County, Upstream of Yellow river
Characteristics of vegetation index and climate variation in Maqu County and their correla-tionship were analyzed using multi-temporal NO-AA AVHRR-NDVI data with 8 km resolution from 1982 to 2000 and daily meteorological data in the recent nearly 40 a. It is found that: the annual mean NDVI from 1982 to 2000 were all larger than 0.4. The vegetation was better in the 1990s than in the 1980s. The precipitation of Maqu in summer was the maximum and that in autumn was more than that in spring. The precipitation increased a little in the background that the average precipitation in the whole country is decreasing. Air temperature increased with a rate of 0. 25℃·(10a)-1. The correlation between ground temperature at 20 cm deep and NDVI was the best. In a certain depth range, the correlation between soil temperature and NDVI became better and better with increasing depth. The correlation between air temperature and NDVI was better than that between ground temperature at 5 cm deep and NDVI. The correlation between ground temperature at 0 cm deep and NDVI and between NDVI and precipitation were poor.
NETL
NSTL
万方数据
维普
